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LP8555 Datasheet(PDF) 6 Page - Texas Instruments |
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LP8555 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 64 page  LP8555 SNVS857 – FEBRUARY 2014 www.ti.com Electrical Characteristics (1)(2) (continued) Limits apply over the full ambient temperature range –40°C ≤ TA ≤ 85°C. Unless otherwise specified: VDD = 3.6 V, EN/VDDIO = 1.8 V, L1 = L2 = 6.8 µH, CIN_A = CIN_B = 10 µF, COUT_A = COUT_B = 10 µF, CVLDO = 10 µF, CVDD = 1 µF. (3) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ƒSW Switching frequency BFREQ = 0 500 kHz BFREQ = 1 1000 ƒSW_ACCURACY Boost oscillator accuracy –7% 7% VOVP_THR Overvoltage protection voltage VBST_MAX V threshold +1.6 V VOUT/VIN Conversion ratio No load, BFREQ = 1 1.3 10 ΔVSW/toff-on SW node voltage slew rate Load current 120 mA. Boost slew 12.5 during OFF-to-ON transition rate set to fastest (SRON = 00b). V/ns ΔVSW/ton-off SW node voltage slew rate 19.5 during ON-to-OFF transition ƒMOD Modulation frequency FMOD_DIV = 00 0.47% (percentage of the SW FMOD_DIV = 01 0.27% frequency) FMOD_DIV = 10 0.17% FMOD_DIV = 11 0.12% CURRENT SINKS Outputs LEDA1...LEDB6, VLEDxx = ILEAKAGE Leakage current 1 µA 28 V Maximum sink current IMAX 50 mA LEDA1...B6 IOUT Output current accuracy(5) Output current set to 23 mA. –4% 4% Current scale set to 23 mA. PWM = IMATCH Matching (5) 1% 5% 100% PFREQ = 000b 4.9 ƒLED_PWM LED switching frequency kHz PFREQ = 111b 39.1 Output current set to 23 mA 200 260 VSAT Saturation voltage (6) mV Output current set to 30 mA 250 340 PWM INTERFACE CHARACTERISTICS ƒPWM PWM input frequency 75 50000 Hz tMIN_ON Minimum pulse ON time 100 ns tMIN_OFF Minimum pulse OFF time 100 Turn-on delay from standby to PWM input active, ON bit written tstart-up 7 ms backlight on high PWM input low time before entering tSTBY Turn-off delay 52 ms standby mode (if PWMSB = 1) ƒIN < 2.4 kHz 12 ƒIN < 4.8 kHz 12 ƒIN < 9.6 kHz 11 PWMRES PWM input resolution bits ƒIN < 19.5 kHz 10 ƒIN < 25 kHz 9 ƒIN < 50 kHz 8 UNDERVOLTAGE PROTECTION VDD falling 2.5 VUVLO VDD UVLO threshold voltage V VDD rising 2.6 LOGIC INTERFACE Logic Input EN/VDDIO VEN/VDDIO Supply voltage range 1.7 5.5 V II Input current 20 µA (5) Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current. Matching is the maximum difference from the average. For the constant current sinks on the part (OUTA1 to OUTB6), the following are determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of all outputs (AVG). Matching number is calculated: (MAX-MIN)/AVG. The typical specification provided is the most likely norm of the matching figure for all parts. LED current sinks were characterized with 1 V headroom voltage. Note that some manufacturers have different definitions in use. (6) Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at 1 V. 6 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: LP8555 |
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